﻿// Copyright 2004-2011 Castle Project - http://www.castleproject.org/
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#region 导入名称空间

using System;
using System.Reflection;

#endregion

namespace LightWork.DynamicProxy.Internal
{
    public abstract class CompositionInvocation : AbstractInvocation
    {
        protected object target;

        protected CompositionInvocation(
            object target,
            object proxy,
            IInterceptor[] interceptors,
            MethodInfo proxiedMethod,
            object[] arguments)
            : base(proxy, interceptors, proxiedMethod, arguments)
        {
            this.target = target;
        }

        public override object InvocationTarget => target;

        public override MethodInfo MethodInvocationTarget => InvocationHelper.GetMethodOnObject(target, Method);

        public override Type TargetType => TypeUtil.GetTypeOrNull(target);

        protected void EnsureValidProxyTarget(object newTarget)
        {
            if (newTarget == null)
                throw new ArgumentNullException("newTarget");

            if (!ReferenceEquals(newTarget, Proxy))
                return;

            var message = "This is a DynamicProxy2 error: target of proxy has been set to the proxy itself. " +
                          "This would result in recursively calling proxy methods over and over again until stack overflow, which may destabilize your program."
                          +
                          "This usually signifies a bug in the calling code. Make sure no interceptor sets proxy as its own target.";
            throw new InvalidOperationException(message);
        }

        protected void EnsureValidTarget()
        {
            if (target == null)
                ThrowOnNoTarget();

            if (!ReferenceEquals(target, Proxy))
                return;

            var message = "This is a DynamicProxy2 error: target of invocation has been set to the proxy itself. " +
                          "This may result in recursively calling the method over and over again until stack overflow, which may destabilize your program."
                          +
                          "This usually signifies a bug in the calling code. Make sure no interceptor sets proxy as its invocation target.";
            throw new InvalidOperationException(message);
        }
    }
}